55278

Appears in sequences

• Triangular numbers m such that A040115(m) is also triangular.at n=26A087597
• Triangular numbers that are sums of two consecutive primes.at n=33A111163
• Triangular numbers for which the sum of the digits is a cube.at n=19A117803
• a(n) = 3*a(n-1) - 2*a(n-2) with a(0)=36 and a(1)=90.at n=10A182467
• a(n) = m*(m+1)/2, where m = floor(n^(3/2)).at n=47A185541
• Triangular numbers which are leg of a Pythagorean triple with hypotenuse in A213188.at n=44A213189
• Least triangular number t such that t = prime(n)*triangular(m) for some m>0, or 0 if no such t exists.at n=22A225503
• Least triangular number of the form p*triangular(n) where p is a prime number, or 0 if no such triangular number exists.at n=36A225789
• Triangular numbers which are an average of four consecutive primes.at n=27A226196
• Triangular numbers which become primes when their rightmost digit is removed.at n=38A227936
• a(n) = A273059(4n+1).at n=41A275917
• Number of crossing-minimal order types of n points in the plane.at n=8A305376
• Integers m such that A342805(m) = m+3.at n=31A342806
• Number of integer partitions of n with fewer distinct parts than distinct divisors of parts.at n=44A371132